In a tweet sent to their followers today, the Dev Team released UltraSn0w 0.93 that will unlock basebands 04.26.08 thru 05.13.04. Yes, that means that UltraSn0w will unlock the following basebands:

04.26.08

05.11.07

05.12.01

05.13.04

This is exactly the reason why I told jailbreakers and unlockers to hold off on updating to iOS 4. If you haven’t updated to the latest firmware then you will be able to install UltraSn0w via Cydia.

If on the other end you have already updated to iOS 4, then rejoice because the Dev Team will update their jailbreaking tools (namely RedSn0w and PwnageTool) so you can jailbreak iOS 4. If you have an iPhone 3G on iOS, you can jailbreak by following these instructions.